What is the primary purpose of gas piping pitch?

The primary purpose of gas piping pitch is to enable proper drainage. In gas piping systems, ensuring that any condensation or moisture can flow and drain away is crucial for maintaining the integrity and safety of the system. This is particularly important in gas lines because accumulated moisture can lead to corrosion, blockages, or even gas leaks, which are hazardous.

Piping that is sloped appropriately allows any liquids that may form to flow downhill and exit the system instead of pooling within the pipe. This helps to prevent the gas from being contaminated by moisture, ensuring efficient operation and reducing the risk of pressure drops or other complications in the gas delivery system.

While other options deal with different aspects of piping systems—such as supporting weight or affecting flow rate—these do not directly address the critical function of drainage that the pitch of gas piping serves. Maintaining proper slope is essential to ensure that the gas system operates safely and effectively, which is why enabling proper drainage is the correct answer.